Fuel-oil burner



W M. HOFFMAN.

FUEL OIL BURNER.

APPLICATION min Nov. 22. 1919.

gil/541mm titi narran stares WILLIAM M. HOFFMAN, OF BFFALO, NEW YORK, ASSIGNOR TO HOFFMAN PRODUCTS CORPORATION, OF BUFFALO, NEW YORK, A CORPORATION OF YORK.

FUEL- OIL BURNER.

Application led November 22, i919.

To all whom 'it may concern:

Be it known that l, WILLIAM M. Horn MAN, a citizen of the United States, residing at Buffalo, county of Erie, State 0i `lilew York, have invented a certain new and useful improvement in Fuel-0il Burners, and( declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the 'accompanying drawings, which form a part of this specification.

My invention relates to fuel oil burners and the process of operating the same. The object is nto provide a simple, inexpensive fuel oil burner adapted to utilize the cheaper, heavier hydro-carbons and in which super-heated steam, volatilizedhydro-carbon and oxygen are thoroughly mixed in order that a more nearly perfect combustion may result.

rlhe device here shown is an improvementon devices described in several applications previously applied vtor by me on hydroztain bon burners oi similar type.

Figure l is an clevatio'oi the apparatus partly in cross-section.

y is a drip pan mounted on suitable supn ports, not shown in the drawing, and formed integral with or adapted to receive and support burner 7L. The drip pan f is provided with a circumferential air inlet opening g. T he burner 7L is here shown in: the form of an inverted cone with hollow wall or jacket h2 which is angular in cross-section, such jacket 71,2 is lilled with an absorbent refractory material. j, asbestos being suitable for this pur` pose. The outer wall f this jacket is pierced with outlet openings vi in number as may be desired, andarranged in such manner as is thought suitable. The object is, irrespective oi the particular forni shown, to provide an oil trough in which the oil may be volatilized and burnedl as it escapes through the outlet ports z'. The absorbent refractory substance carried in this trough will naturally serve to assist in the' volatilization oi the hydro-carbon used as fuel. Oil is supplied to this burner 7L from an oil reservoir b, communicating with said burner by means of a conduit f. The passage of oil through this conduit may be regulated by means of a valve bs. This inverted conical burner is provided with an axial passageway therethrough, indicated at ha, which serves Specification of Letters Patent.

t Patented June i, i920..

Serial No. 339,857.'

conduit c2 which leads from a water vaporv reservoir (Z. This nozzle is here shown as integral with the drip pan. lt is apparent, however, the purpose would be as well served if the conduit e2 were fitted with such nozzle at its lower extremity, such conduit being bent to direct the vapor jet in the manner here shown.

Superimposed over this burner it and spaced therefrom so as'to provide an auxf iliary passageway therebetween is a water vapor generating chamber o. This water vapor generating chamber c is in the Jform oi a hollow, jacketed cylinder and the jacketed wall thercoil, indicated as c2, serves as the generating chamberproper. Chamber c is tired to the burner h by means of bolts 7cand held in spaced relationship thereabovc by means oi spacer tubes 7a2 which encircle these bolts and upon which the base c3 oi the generating chamber rests. o is a water reservoir which communicates with the lower portion of the hollow wall oi the vapor generating chamber c by means of a conduit a2. The iiow oi water through the conduit o2 may be regulated by means oit a valve a3.

Located at a higher level than the water level in the waterreservoir is a water vapor reservoir al. vapor communicating means, indicated as d2, is provided between the up'- per portion of the generating chamber c2 and the vapor reservoir L rllhe conduit e2 leads from the water vapor reservoir Z to the nozzle e. The passage of vapor lthrough this conduit may' be regulatedby means of a valve el'.

rhe method of operation is, ysfiollows:

To start the burner, oil is allowed to iiow from the reservoir 5 'to the trough h2, A

more highly volatile oil .is placed in the drip way has been provided intervening the outer Wall of the burner and th'e inner surface of the drip pan. Through this annular passageway air is drawn from the air opening g passing along the entire front of the burning jets emitted from the part holes z. Thls draft is increased by they action of the steam jet from the nozzle e. The burning hydro- .carb'onis thus mixed with oxygen while 1n this passageway or auxiliary mixing ,chamvber and this compound is further mixed when it enters the mixing chamber and min'- gles with the water vapor projected from the A i nozzle c. With good combustion the burn'- ing should be most complete at the upper eX-' tremity of the chamber h3 where the products ofv combustion would burn with an intense blue Iiame.

It will be observed that in the method here adopted the oil trough in which the' fuel is volatilized is almost completely en# circled by the burning hydrocarbon and that the absorbent refractory substance therein contained, through which the oil must pass, will increase the exposed surface per l given quantity of fuel and delay the passage thereof so that volatilization will be most posed inthe lower portion of said chamber,

nearly complete.- By virtue of the location of `the air inlet with reference to the fuel port holes a forced draft is created below the burning jets from such port holes which will draw the oxygen along their entire front so as to increase the quality of the combustion.

As the water vapor'vcoming from the re'ser-v' voir vai would be more or less heavy with condensed vapor particles, this vapor lis superheated before it reaches' the nozzleby posed with reference to the combustion chamber that the heat in such chamber will superheat the vapor in the conduit. This is accomplished in the. device illustrated in the drawing bypassing the conduit directly through the combustion chamber. y

Claims: l

1. In a device of the class described, an inverted conical drip pan, an inverted, conical, hollow, jacketed oibburner with perforated outer wall concentric with said drip pan, and carried therein and supported thereby, so as to provide an annular chamber therebetween, an air` inlet. o ening at the -upper extremity of said cham er, a nozzle so disthe cbnduit leading thereto so dis.

reenter lar chamber between the 'outer wall of such oil burner and the wall of such drip pan, an air inlet opening in such drip pan above the perforated outer wall of such burner, means for projecting a jet of vapor into the hollow interior of such burner, such meanssolocated as to produce an air draft along the entire front of the perforated faceof the oil burner and to force the products of combustion upward into the hollow interior thereof, means for supplying water vapor to such vapor projecting means, means for supplying oil to such oil burner.

3. In a device of the class described, a hollow, jacketed oil burner with perforated outer wall, an oil drip pan encircling the same and providing an annular chamber therebetween along the front of said perforated wall, said annular phamber opening at the top to provide an air inlet, vapor projecting means so disposed in the lower portion of such-annular chamber as to project ,vapor upward into the hollow interior of such oil burner and so located with reference to the air inlet opening to suchl annular chamber as .to draw an air draft therethrough along the entire front of said perforated wall and to force the products of combustion upward into the hollow interior 'Y of such burner, means for supplying water vapor to such vapor projecting means, means for supplying oil to such oil burner.

4. In a fuel oilburner a' hollow, jacketed, inclosed oil trough, the outer wall of-which is perforated, an absorbent refractory filler for such oil trough, a drip pan adapted to encircle such oil trough and spaced therefrom so as to provide an annular chamber therebetween along said perforated wall, an air inlet opening at the top of saidA annular chamber, vapor projecting means' so dis posed in the floor of such drip pan as to draw an air draft through such air inlet .opening at the upper portion oflsaidl annuterior of such oil trough, means for supplying oil to such oil trough, means for supDlvlng Water vapor to such vapor projecting means. Y

5. In a device ofthe class described, a hollow oil burner provided with an out wardly perforated, j acketed wall, adapted to serve as an oil trough,a drip pan adapted to receive such oil burner and so spared therefrom as to provide an annular chamber tl1e1el. et\\'een alonev said perforated wall, an air inlet openingrg` at the top of said annular ehanlber, apor projectine` means so disposed as to project a vapor blast into the hollow interior of the oil burner and so positioned with reference to the air inlet openling` and the perforated wall of said trough as to draw a draft of air along;l the entire tront ot said pert'o `ated wal';,. means for supplying oil to said oil trough, a hollow, jacketed cylinder adapted to serve as a vapor generating chamber superimposed over said burner7 means for supplying' water to said generating` chamber, a water vapor reservoir located at a higher level than the water level in said water supplying means ot said generating chamber, communieating means between said vapor generating chamber and said 'vapor reservoir7 eonnnunieatinga means between said vapor reservoir and said vapor projectingl means.

(3. ln a device ot the class described7 a hollow oil burner provided with an outwardly perforated jaeketed wall adapted to serve as an oil trough, a drip pan adapted to receive sueh oil burner and spaced therefrom so to provide an annular chamber therebetween alone` said l erl`orated wall7 an air inlet opening at the top of said annular chamber, a nozzle so disposed in the ioor oli said drip pan as to project a liet of vapor nl nvardly into the hollow interior o'l" said oil ehambe andaso disposed with relierenre tosaid perforated wall ot said oil trough and said annular Chamber as to draw an air draft along' the Jfront ol" said perforated wall and to force the products ol combustion upwardly into said hollow interior/ot said burner, a hollow, jaelv'eted7 eylinder ot greater interior diameter than the diameter ot the interior oh said burner superiinl'losed over said burner,l an elevated water reser voir, oommunieatiixie` means between said oill water reservoir and the jarlieted wall ot' said ovlinder, a water vapor reservoir loeated at a higher level than the 1I-eter level in said water reservoir and provided with ronununiratinemeans therewith, eonnnunirating means between said water vapor reservoir and the jarlv'et of said cylinder` aV eolnnulnirating ronduit between said water apor reservoir and said nozzle, said ronduit so disposed with reterenre to the burner that the vapor passing` therethrolm'h will be superhmted before it reaehes the nozzle.

T. ln a' device of the class deseribed, a hollow, jarlv'eted oil burner with perforated outer wall. an oil drip pan enrireling said burner and providing an annular rhainber therebetween alone` the liront ol' said perforated wall7 said an. at the top to provide a'n air inlet7 vapor projeetinglmeans so disposed inthe lower portion ot' said annular rhambe as to project vapor upward into the hollow interior of sueh oil burner and so located with reterenee to the air inlet opening),` of sueh annular ('hamber as to draw an air dra't't therethrough along the entire. liront of said perforated wall and to l'oree the produets ot eombustion upward into the hollow interior ot sueh burner, a steam Ygenerating` chamber superimposed over said burner, a water reservoir, water ronununiratinel means between said reservoir and said steam generating' rhamber, a water vapor reservoir lorated at a higher level than the. water level ot said water reservoir and romuumieatingg,` therewitln eommuneating means between said steam generating rhanlber and said vapor reservoir, a conduit between said vapor reservoir and said vapor projeeting means, said eonduit passing'through the hollow interior olf said burner.

ln testimony wluxreot l sign this specilieation.

ar chamber openingr 

